GNSS Revision Quiz

Galileo, GLONASS and BeiDou are all types of:

• GPS

• GNSS

• Reciever modules

• Space segments

The 3 segments of a GNSS system are:

• Space

• User

• Airbourne

• Control

• Ground

The satellite constellation uses 24 satellites in how many orbital planes?

• 4

• 3

• 6

• 12

The satellite constellation uses 24 satellites PLUS how many operational spares?

• 8

• 3

• 10

• 2

Select the most correct answer

• All satellites transmit on the same 2 L-Band frequencies, just different pseudo-random codes

• All satellites transmit on their own frequency but the same pseudo-random code

• Satellites transmit on the L1 frequency for precision military ranging

Within the pseudo-random code the satellites transmit: (select all that apply)

• Ephemeris data

• Almanac data

• Satellite maintenance/health status

• Atomic clock referenced time and corrections

The user segment:

• Consists of 24 satellites in 6 orbital planes

• Receives, decodes, processes and displays the information given form the satellites

• Is located in ground stations around the world

• Is located in Colorado Springs, USA!

If 4 satellites are in view:

• Position and altitude (3D) information will be available

• Only 2D position information will be available

• RAIM will be available

• Fault Detection and Exclusion (FDE) will be available

GNSS navigation works on the principle of:

• The user segment sending radio waves to the satellites and the radio energy reflecting back off the satellite

• Secondary Surveillance Radar (SSR)

• GNSS measures distance from the satellite by measuring travel time of a radio signal from the satellite to the receiver and uses triangulation or tri-lateration to determine a position

• VHF using Frequency Modulation

Ephemeris Data is:

• The same as Almanac Data

• An error caused by the Earth's atmosphere

• The predicted location of all the satellites in the constellation

• The satellites position in space